The client-side raster functions are operations that apply processing directly to the source image pixels. The calculations are only applied to the source pixels that are visible in the map as you pan and zoom within the map. The following raster functions can be applied to an ImageryTileLayer by setting its rasterFunction property. The rasterFunctionConstants module provides constant values that can be used as parameters of different raster functions when setting the layer's rasterFunction.

You can click on the raster function you are interested in and this application will show a brief description and code snippet.